Step 1: Preheat your oven to 350°F (175°C) and grease a 9x5 inch loaf pan.
Step 2: In a large mixing bowl, mash the ripe bananas with a fork until smooth but slightly chunky.
Step 3: Stir the melted butter into the mashed bananas until well combined.
Step 4: Mix in the granulated sugar, beaten egg, and vanilla extract.
Step 5: Sprinkle the baking soda and salt over the mixture and stir in.
Step 6: Gently fold in the all-purpose flour until just combined—do not overmix.
Step 7: Fold in the toasted chopped walnuts.
Step 8: Pour the batter into your prepared loaf pan and bake for 55 to 65 minutes.
Step 9: Test for doneness by inserting a toothpick into the center; it should come out clean.
Step 10: Let the bread cool in the pan for 10 minutes, then remove to a wire rack to cool completely.